That's just a scale/unit conversion - the number of arcseconds in a degree (3600) divided by the number of microns in a mm (1000).

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Hi Bassliner, Thanks for the info. And where does the 3.6 come from? Doug Doonan

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Unpowered hubs are notorious for this kind of behavior. Good this time, not the next. Wes

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Thanks for the suggestion Wes - I think time and location are all aligned but I will check. And I'm sure you're right on the hub, Bob. I got this one because I wanted one less device to draw power if

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Parag Yes, there are no limits built into the driver, unless you do a goto. The driver will slew you around correctly according to the need to do a meridian flip. But it will allow you to track throug

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Leigh: Sounds like time or location or both are off for stellarium and ascom driver. Make sure stellarium location and time are same as the ASCOM driver location. Wes.

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HI Jerry, This straightens me out on the formula and how it works. Pretty neat. Also, thanks for the chart. It will be handy in my set-up. Boy, all I can say is that this astronomy stuff is complicate

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Leigh, Whatever else is going on, you might want to pre-emptively switch that unpowered USB hub out for a powered one... Lots of tales of woe over on CloudyNights from folks who experienced various fo

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Hi all Thanks for the always-interesting discussions in this forum! I am a relative beginner but starting to get the hang of the PMC-8 EXOS2 mount and my imaging setup. Occasionally, I will press the

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Wes, I don't use auto meridian flip feature of ATP and therefore should have continued tracking (in fact it executed my full 75 image plan as expected). When I platesolve the last 20 images, they are

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I see. WEll perhaps Jerry would consider having a "quiet" mode slew. But honestly, the sound is low enough that in my experience, the sound is compatible with star parties. Slewing more quietly though

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There are 206265 arc-seconds per radian so the formula is the conversion between an angular value to a linear scale at the image plane. The value is 206.3 (rounded 206.265) because of the FL being in

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Doug, here is a table that might help. Otherwise Peter Zelinka on You Tube explains the formula in his video choosing your first dedicated astronomy camera.

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Thank you all for your help, I will try switch guiding from my guide scope (162 mm) to my imaging scope (480) and see if guiding improves next time I have clear skies. That will give my a pixel scale

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Hey Doug, The formula is:pixel size (microns) x 206.3 /focal length in mm = image scale in arcsec/pixel 206.3 results out of:3.6 * (180 degrees / pi) = 3600/1000 * (180 degrees / pi) = 206.26 Doug Doo

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Jerry, Where does the 206.3 in your formula come from, and what are its units? Doug

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Thanks for your reply Wes, When in my backyard, the slewing noise is fine, I am thinking about when I'm in a campground, with close neighbors, slowing the slew speed down would reduce the whiling nois

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Rob The pmc8 manages its own slew speed. The ascom driver executed a specific command to the pmc8 which takes it from there. What is it about the programmed speed you feel the need to change? Wes

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Good Afternoon, Using the PMC* connected via \serial, and slewing commands sent by Stellarium, I am trying to adjust the slewing speed a bit slower. Using the ASCOM Profiler, I simply cannot find the

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Hi Walter, Yes, I would suggest a 2x Barlow or tele-extender instead of a 3x. The formula for pixel or plate scale is: Pixel Scale = (Pixel Size x 206.3) / FL, So for your combination: Pixel Scale = (

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